Traveling-grate furnace.



' ,PATENTBD SEPT. 23, 1908.

. II.- HARRINGTON.

TRAVELING GRATE FURNACE.

APPLICATION FILED FE ZZLJZGSSQAS, Ewe/ZZZ;- l7

6% lkrrugghu No. 898,101,. PATENTED SEPT. s, 1908.

J. HARRINGTON. TRAVELING GRATE FURNACE.

ABPLIOATION rum) FEB. 2a 1906.

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Jwe/W' JSgFLEirruggE}; 5 M W No. 898,101. PATENTED SEPT. 8, 1908. J. HARRINGTON. TRAVELING GRATE FURNACE.

APPLICATION FILED FEB. 23, 1906.

4 SHEETS-SHEET 3.

PATENTED SEPT. 8, 1908.

J. HARRINGTON. TRAVELING GRATE FURNACE.

' APPLIGATION FILED FEB. 23, 1906.

4 SHEETS-SHEET 4.

1 j jZZ/CJZZE g w wm tact with which the bridge membc n ores moi UJL linen iw hi-Linn JOSEPH HARRINGTON, OF CHICAGO, ILLINOIES, ASBIG'N OR TO GREEN ENGINEERING COMPANY, OF CHICAGO, lLLiNOlS, A CORPORATION OF lLLiNOlS.

"ERAVELINF Ii'tiifilil FUR-NA Specifieetionof Letters Patent. atented Sept. 8, 1908.

Application filed February as, love. fierial 1%. 302,599.

To all whom it may concern:

Be it known that l, Josnrir HimmNcroN, a citizen of the United States, of Chicago, in the county of Cook and State of Illinois, have invented certain new. and useful Improve inents in Traveling-Grate Furnaces and I do hereby declare that the following is a" full,

clear, and exact description thereof, reference bustion and tolprevent the passage of air be tween the rear end of the grate and the bridge wall.

The invention relates more especially to an adjustable, watencooled bridgapiece or water-back of that kind shown in my prior application for United States Letters Patent, Serial Number 226,417, filed February 28th, 1904. In the rinc-ipal construction shown in my eforesai apphcstion, the bridge-piece is pivotally mounted at the side walls oi the furnace to swing toward and from the grate on an axis of oscillation that maintains the bridge-piece in contact with a downwardly and forwardly facing, convexly curved, been ing surface of the overhanging portionof the bridge wall, thereby avoiding passcge of air between said bridge piece and the bridge wa'll. Owing to the intense heat to which the overhanging portion of the bridge well is subjected, it is found that such curved hearing surface of the bridge wall tends to become roughened by corrosion or burning away, and also by the clinging of 'clinkers and ashes thereto, thereby producing an irregular surface. Such irregularity of the bearing surface, if caused by corrosion, ermits-the assage of air between the bridge iece and rid e wall; or if caused by aderence of clin ers to the wall revents free mOVemeHt of the swinging bri ge piece rel- -at1vely to the bearing surface of the well.

, .In accordance with my present invention. I'propose to embody in the overl'ianging por tion of the bridge wall a water-cooled incinb'er, preferably made of a. metal tube, in conwhen'it is originated toward and av.

the upper surface of the grate, whereby is avoided the destructive action of the heat on the surface in contact with which the bridge piece is adjustably movable.

Furthermore, in my approved construc tion the bearing surface of the overhanging pert of the bridge wall in contact with which the bridge piece moves during its adjustment, laces downwardly and. rearwardly and the bridge piece swings upwardly and rear wardly away from the grate contact with said bearing surface. This arrangement minimizes or entirely avoids the liability of clinkers and ashes clinging to said bearing surface of the bridge well in a manner to interfere with the adjustment of the bridge piece. 7 I

In the accompanying drawings, I have shown my invention as applied to a furnace equipped with. a. traveling chain grate, and have shown a bridge-piece substantially like that illustrated in my aforesaid application. Such construction is shown as merely illustrative of one practical embodiment of the invention.

The invention relates also to means forcontrolling the movement of the movable bridge piece in such manner as to maintain the desired thickness of the fuel bed and avoid the escape of unconsumed fuel from the grate.

- As shown in thedrawings:Figurc 1 is a View in longitudinal vertical section of the rear end of furnace and its bridge wall, showing in side View the rear portion of a traveling grate, end my water-cooled bridge piece located between the grate and the overhanging portion of the bridge wall. Fig. 2 is an enlarged transverse, vertical section, taken on line 22 of Fig. 1, showing the parts constituting the principal elements of my invention in elevation. Fig. 3 is a View similar to Fig. 2, but showing all the parts in section. Fig. l is on end eleyzition of the. water-coolrd bridge wall member. Fl 5 a section, taken on line 5-5 of Fig. 4-. 'Fig. 100 6 is an. external View showing the sidewall of the furnace and a supporting plate by yvhich are supported the ends of said bridge piece and bridge Wall member, illustrating also the water connections for the Water-cooled part.

' the bridge wall. .60

adjusted to coal beds of varying thicknesses. Fig. 9 is a partial section and a partial elevation of said parts.

As shown in the accompan ingrdrawings, A A designate the side we sflolt ga steam boiler furnace, B the rear or innerportion of a traveling chain grate, and A a bridge wall which extends across the furnace at the rear of the grate and is provided with a projecting part A which overhangs the rear end of the grate.

designates a tubular, water cooled bridge piece which extends transversely across the furnace over the rear part of the grate beneath the overhanging part A of the bridge wall and engages the lower por- .tions of said overhanging part to close the space or openin between the bridge wall and the layer of fuel. on the grate against the passe e of air. I The bridge piece acts also to ho d back or retard the passage of unconsumed fuel from the grate. The bridge picceC does not have contact directly with the refractory material constituting the bridge wall, engages a Watercooled member D constituting part of the overhanging portion. of the bridge Wall. Said Water-cooled member D extends between and is supported at its ends on the side walls of the furnace. It is tubular and is provided with a convcxly curved lower and rear beari surface in contact with which the cylin. outer surface of the bridge piece mov during its adjustment toward and fr io grate. As herein shown, the bridge iember is cylindric. The said tubule lge piece a (1 bridge wall mem ber e it their ends past lthe inner faces sale walls of the furnace into openings or recesses A A in said side walls of the furnace. The said bridge wall member D is stationary While the bridge piece C is bodily movable or capable of being shifted bodily towards and from the grate, while maintaining its contact with the bridge wall member. lln order to protect the water-cooled bridge wall member horn the direct heat of the fire on the grate, the forwardly facing side and top of such member is embedded in the overhanging portion of the bridge wall. As shown, said member is covered by a shield consisting cf suitably shaped fire-brick D, the lower surfaceof which is concave to fit the convex surface of the brid e Wall memher. The said protecting shie (1 extends at its lower margin downwardly to the lower side of .the bridge wall member D, and con.- stitute; part of the overhanging portion of The shield, as shown, consists of tiles of suitable length (Fig. 2), each tile being concave on its lower surface to fit the tubular bridge Wall member, said tiles having on their forward sides depending portions or lips that fit in front of the tubular r1dge member and protect the front surface 'sitions of adjustment of the former.

thereof. The said shield tiles are made of a depth to fill the space between the bridge wall proper and the tubular bridge wall member; It will be furthermore observed that the water-cooled bridge member, which is supported at its ends in the side walls of the furnace, constitutes a support for the forward part of the overhanging portion of the bridge Wall.

As a means of effecting bodily shifting of the bridge piece relatively to the bridge wall member, said bridge piece 'is pivotally mounted at its ends in and sustained on the side walls of the furnace, so tlrat it may swing or rotate in a curved path toward and from the grate. The downwardly and rearward ly facing bearing surface of the bridge wall member is curvcd concentrically with respect to the pivotal axis of the bridge piece, thereby mai taining contact between the bridge piece at d the bridge wall member in all lplo- 1e bridge piece herein illustrated swings about an axis which is located radially outside of its own diameter, so that said bridge piece is swung or moved and slides around or over the bearing surface of the bridge wall member. v The said pivotal mounting for the bridge piece is so constructed that the bridge piece swings rearwardly and upwardly or in a direction away from the body of fuel on the grate. This arrangement avoids the tendency of the clinkers clinging to the bearing surface in contact with which the bridge piece moves.

The means shown for pivotally sup orting the bridge piece C are constructed as ollows: At the outer side of the recess A is located a horizontal bearing sleeve E in which is rotatively mounted a trunnion c which is connected by means of a rigid offset arm 0 with the adjacent end of the bridge piece C. As herein shown, said arm enters and has screwthreaded connection with the hollow bridge piece. E designates a bearing plate for the opposite end of the bridge piece, said plate being located at the outer face of the side wall A and in position to I close the recess A Said plate E is fixed to a rectangular metal frame E which is built in the recess A of the wall A, said frame being provided at its topand bottom with inwardly extending flanges c to which the bearing plate E is bolted at its margins. This construction permits said bearing plate to be detached from the furnace wall. a bearing apertufie e which is engaged by a journal or trunnion 0 extending outwardly from the offset arm (3 at the adjacent ends of the bridge ,pi cco. Said trunnion c is located in line with the trunnion c, and the arms are offset to bring the pivotal axis of the bridge piece concentric with the downwardly and rearwardly bearing surfaces of the bridge piece, or in lme with the longitu- Said bearing pl-atc E is provided with i m are,

ietter 1S 0? r r r: and a. water iece.

ii erdly beyond the bearing piste to term it nipple c which is edcpted on for attachment thereto of s, supiltiy hose C Seid nipple is provided the trunnion c with en engulsr or part 0 (Figs. 3, 6 and 7), adapted to receive the correspondingly shop-ed soc in the hub K83; of a lever F by which it swinging or oscillatory movement may be imperted to the bridge piece The srm W is i 0 terminating in tutes's water possee tion with the interior o through a pipe c thst e1 lowbridge niece thereof nesr end remote i c. The sci-d neck constitute sege tor the cool erm end trunnior sage. The cooling sgent let pesssge in Git-2v of the cooiing Said net- 2 uplied to the manner as so or the slot c, as shown in Fig. 6. 32nd ,letc G is or sided ep- 'erturc throng which ssiid nee l: extends and cover is made longer than the slot so as to said slot in all ositions of the neck 0, dicated most ereerly in Fi As shown inl ig. 6, the bridge piece is 1303i" tively locked in a predetermined adjusted position, said locking means consisting of a pin edap ted to be inserted through a hole in the lever and any one of several holesf in s seg- -1nentel bar F secured to the outer face of the piste, and curved concentrically to the swing ing axis of the lever.

In some instances, the bridge piece may be so mounted that it will autometicelly edjust itself to fuel and ash layers of varying thick nes'ses. One means of effecting this result is to attach 9. weight to the lever F in such manner that it ets together with the weight of the bridge piece to hold the bridge piece in its lowermost position. A thickening of the fuel has the effect, therefore, to autoinsticolly raise the bridge piece, while at the same time a pressure is maintained. upon the ins? and ssl, layer that prevents the unburned. beneath the bridge piece and passage of air between the r piece and fuel and ash layer. The ter suggested construction is shown in s 5s. 8 and 9, and consists of 3. weight H card b ssid lever F. As shown, the lever is proviced with a plurality of apertures f and the weight is suspended from the lever by a short csble t having a hook it adapted to severally engege said apertures f of the lever.

From. the construction described, it will be observed that shifting the lever F the bridge piece G may be swung or adjusted on its pivotal axis to bring it into any desired position with respect to tho grate, and that ring such adjusting movement, the bridge piece is maintained in contactwith the water cooled member of the bridge wall. When bridge pieceis in its iowermost position, as sh wn in full lines in Fig. 1, it is in contact with the lower face of the water-cooled memher, and when swung away from the grate, es indiceted in dotted lines in Fig; 1, it is located in reel of said weter-cooled member. adjusting the bridge piece as described, its lower surface may be brought to a position a. greater or less vertical distance from the top surface or the grate end thereb vary the thickness of the layer of ashes whic rests on the grate beneath it.

Referring now to the manner of'rnounting' seid wetencooled bridge wall member atits ends in'the side walls of the furnace, this construction is as follows: The water-cooled member is provided at its ends with oifset or angular attaching erms D D which are inclined forwardly end upwardly (Figs. 1, 4 and Y) in said side wall openings A A so as to afford ample space for the offset arms of "the bridge piece which are located exterior to the ends of the bridge wall member, and also to provide room for said arms to swin on their pivotal axis. The arm D is flange and is ooltcd to a flanged ring d surrounding and having scrsw threaded connection with the adjacent end of the tubular body of said waiter-cooled member. The outer end'of the arm D is formed to provide an angular stud d which enters a socket in the side wall opening A, thereby fixing said arm in place. The attaching arm D at the opposite end of the bridgewall member, is provided at its outer end with a narrow oblong stud or projection d which is adapted to fitwithin e correspondingly shaped opening in the removable plate E end thereby hold said arm fixed to the plate. The attaching arm D of said water cooled member is provided with two passages d d, the former of which' hasfdirect communication with the interior of said water-cooled member, and the latter of which has communication with said water-c0oled member through a pipe (1 that extends to within a short distance 01 the end of said water-cooled member remote from the arm I). The said passages d," communicate, respectively, with cooling agent supply and return pipes D D", as shown in Fig. 6. As herein shown, the passages 0 and d of the arms C and D", respectively, of the bridge piece and water-cooled member of the bridge wall, constitute the inlet water passages which communicate with the supply pipes C I) leading from a common supply pipe I)", while the passages c d constitute the outlet passages and communicate with the outlet pipes C D that lead to a common outlet pipe D Inasmuch as the nipple c and the neck 0 associated with the bridge piece are movable, the pipes C C", communicating there with, consists, in part, of flexible hose. The water-cooled bridge wall member being stationary, the pipes I)" l communicating with the passages thereof "may be made rigidly connected by stationary joints with said passages.

I claim as my invention:

1 The combination with a traveling furnace grate and a bridge wall having a part which rojects forwardly over said grate. of a ivotahy mounted, adjustable bridge piece )etween the wall and grate, the overhanging part of the bridge wall being provided with a convexly curved, downwardly facing bearing surface adapted for contact with the. bridge piece in :illpositions of the latter.

2. The combination with a traveling furnace grate and a bridge wall having a part which projects forwardly over the grate, of a bridge piece extending transversely over the grate and provided at its ends with bearing trunnions by which the bridge piece. is pivotally' supportcd, the overhanging part of the bridge wall being provided with a convcxly curved, downwardly facing bcarii'ig surface adapted for contact with the: interi-nediate portion of the bridge piece in all positions of the latter.

3. The combination with a traveling fur nacc. grate and a bridge wall having a part which projects over said grate, including a water-cooled member, of a movably mounted bridge-piece in contact with the said watercooled bridge wall member, and adapted to be shifted towards and from the grate while maintaining its contact with said bridge wall member.

4. The combination with a traveling furnace grate and a bridge wall having a part which projects over said grate. including a water-cooled member, of a bridge piece in contact with said water-cooled bridge wall member, said bridge piece being pivotally mounted to swing bodily towards and fronr some].

the grate while maintaining its contact with said Water-cooled member.

5. The combination with the side Walls of a furnace, a traveling grate-and a bridge wall I bridge wall, anda pivotally mounted adjustable bridge piece in contact with said Watercooled member, said water-cooled member having a convexly curved, downwardly facing bearing surfaee'adapted for contact with the bridge piece in all positions of adjustment of the-latter.

6. The combination wit-lithe side wall ofa furnace, a traveling grate and a bridge wall having a forwardly projecting overhanging art, of a tubular, downwardly facing mem- )cr constitutin a portion of the said overhanging part of the bridge wall, a )ivot-ally mounted, adjustable, tubular bridge piece located incontact with said tubular bridge wall member and ada ted to maintain its contact therewith in a positions of adjust ment of the bridge piece, and means for circulating a cooling agent through said tubular bridge piece and bridge wall member.

7. The combination with the side walls of a furnace, a traveling grate and a bridge wall having a forwardly projecting overhanging part, of a water-ctmlcd member constituting a portion of said overhanging part of the bridge wall, of a pivotally mounted bridge )iecc in contact with said bridge wall me] 1- ber, said bridge wall member having a co vexly curved downwardly and rearwardly facing bearing surface adapted for contact with the bridge piece in all positions of adjustment of the latter, the bridge wall being constructed to provide a shield for the forward side of said bridge wall member.

8. The combination with the side walls of a furnace, a traveling grate and a bridge wall,

of a tubular water-cooled bridge wall merriber located in front of the bridge wall and fixed at its ends in the side walls of the furnace, and tiles which test on the said tubular bridge wall member and fill the space be-.

tween the latter and the bridge wall, said tiles being rovided with depending lips extcndin in rent ofsaid bridge wall member.

E). The combination with the side walls of a furnace, a traveling grate and a bridge wall, of a tubular water-cooled bridge wall member located in front of the bridge wall and fixed at its ends in the side walls of t-hefurnace, tiles which rest on said tubular bridge wall member andfill the space bet-ween the justebly connected with 10. The combination with the side walls of a furnace, s traveling grate end a. bridge Wall having a forwsrdly projecting overhanging part, of e. tubular watencooled bridge wall member located. beneath seid overhanging )srt of the bridge wall end fixeo at its ends 111 the side walls or" the furnace, tiles interposed between said overhanging part of the bridge will and the tubular bridge well. member, said tiles being provided with concave lower sur aces to fitthe tubulsrbridge well member, and with depending lips extending in front ol. said bridge well member.

1 1. T he combination with the side wells of a furnace, a traveling grate and e. bridge wall having a. forwardly projecting overhanging portion, of a tubular waiter-cooled bridge well member, extending across the furnace and fixed at its ends in said side walls and supporting the said overhanging part of the bridge well, and on 1rd justublc writer-cooled bridge niece adop d to be bodily shifted relatively to the brid s l member .vhile remaining in contra .eiewith in all its positions of adjustment.

12. The combinut; including tubular we a. pivotully supported, cooled bridge piece with bridge well, r-cooied member, of adjustable writer- 0 l. to be bodily shifted relatively to the bridge well n'icniber, while nmintuining contact therewith.

13. The combination with the side wells of the furnscc, s traveling grate and an overhanging bridge well, including o. tubular water cooled member supported at its ends in the side walls oi the furnace, of en adjustable bridgepiece in beurr g contsct with said bridge well member, and provided at its ends with oll'set arms having trunnions rota/lively mounted in said. side walls co' c=-ntricelly with the exterior bearing sunrise of said bridge piece, a, lever to the trurr nions of said. bridge piece, or

14. The combination traveling grate and a bridge well. including tubuler water-cooled member, of e pivotall sup-- ported, adjustable "\vstencooied bridge n ece adapted to be bodily shifted reletiv w to bridge WfLll member, while insintu-inr tact therewith, end. {LE1 sdjustsble o. acting with the weightof the bridge tending to hold the bridge piece in its lower-- most position.

15. The combination. side we" the furnace, traveling grate an 0 hanging bridge well, includinq e. tub ler water cooled mom I 3 1 :rble bridge piece in. beer bridge wall member 5 L ed with, ollset arms hev'ir truunions rotetiveiv mounted in ssidside wshs consent 'Wlth the 82;?617103. beefing si passages connected with said tubular bridgepiece nndbri go well member.

17. The combination with the side walls of a. furnace and e troveling grate, or :1. bridge well provided with an overhanging part, including s water-cooled member, of s swing-- ing wetter-cooled bridge piece in contact with the water-cooled bridge member and having trunnion the side wells of the furnace.

3.3. The combination with the sidewalls of a. fu nace it traveling grate and its overhang ing bridge well, including a. tubular, watercooled member su aported at its ends in the side walls of the turnece, end having a cylindric bearing surface, of an adjustable bridgeipiece in, bearing contact with said bridge well'member and provided st its ends with arms having trunnions rotatively n'iounted in ssid side wells concentricallfi with the. exterior bearing surface of suit bridge well member.

19. The combination with a furnace, u traveling grate and a. bridge wall having on overhanging pert, oi 9. tubular, water-cooled member supported its ends in the side walls of the iurnece and constituting a. portion of said overhanging pert or the bridge well, and adjustable bridge in bearing contest with said bridge wen. inemoer and provided at its ends with oii'set having trunnions rotetively mounted in said side wells in line with the centred longitudinal axis of the bridge wall member. 4

20. The combination with the side wells of s iurnece, a traveling grate and a bridge "wall having an overhanging part, of a tubuzir ws'ter-cooled member constituting a portion or the overhanging pert oi the bridge well, bridge 19%) contact with said it its ends which are mounted in the side walls of bridge welt rneinr er provided at ends with otlset hsving trunnions which roto tivelg mounted in said side wells, said oilzirins extending upwardly between the I P said bridge well member and the pports for the trunnions, and. the ii menibe. having end ol set turns :3 1 4 rod 72, said side wells.

combine-bible with the side wells of" traveling end 2. bridge Well overhanging pert, of tubular cooled member constitutin 2. portion of said overhanging part of the brid e wall, the bridge piece and bridge well member beand a bridge piece'in Contact with sai bridge ing located in different lanes. wall member irovided at its ends with offset In testimony, that I c aim the foregoing as arms having trunnions which are rotatively my invention I effix my signature in resenc-e 5 mounted in said side walls, said oflset arms of two witnesses, this 21st dey of lji ebruery 15 extending upwardly between the ends of said A. D. 1906.

bridge wall member and the bearing sup-| JOSEPH HARRINGTON. ports for the trunnions and the bridge wall Vitnesses: a member having end offset arms by which it C. CLARENCE POOLE,

10 is fixed in said side walls, said offset arms of G. R. WILKINS. 

